The first planet orbiting another sun, 51 Pegasi b, is discovered.

51 Pegasi b, officially named Dimidium, is an extrasolar planet approximately 50 light-years away in the Pegasus constellation. Dimidium was the first planet to be discovered orbiting a main-sequence star, the Sun-like 51 Pegasi — a major astronomical discovery. It is the prototype for a class of planets called hot Jupiters.

Artist impression of the exoplanet 51 Pegasi b
Artist impression of the exoplanet 51 Pegasi b (Source: Wikimedia Commons)
Pegasus 51 location
Pegasus 51 location (Source: Wikimedia Commons)
Profile of planet 51 Pegasi b (cropped)
Profile of planet 51 Pegasi b (cropped) (Source: Wikimedia Commons)
First exo 39x27 CMYK-1
First exo 39x27 CMYK-1 (Source: Wikimedia Commons)

Watch: 51 Pegasi b: The Planet That Changed Astronomy Forever

From the Documentary for Sleep channel.

Sources and further reading: Wikipedia — 51 Pegasi b (CC BY-SA). Images: Wikimedia Commons.